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Diffstat (limited to 'src/minutils/s6-uevent-spawner.c')
-rw-r--r--src/minutils/s6-uevent-spawner.c243
1 files changed, 0 insertions, 243 deletions
diff --git a/src/minutils/s6-uevent-spawner.c b/src/minutils/s6-uevent-spawner.c
deleted file mode 100644
index 87dea11..0000000
--- a/src/minutils/s6-uevent-spawner.c
+++ /dev/null
@@ -1,243 +0,0 @@
-/* ISC license. */
-
-#include <string.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <spawn.h>
-#include <signal.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <skalibs/config.h>
-#include <skalibs/allreadwrite.h>
-#include <skalibs/bytestr.h>
-#include <skalibs/buffer.h>
-#include <skalibs/types.h>
-#include <skalibs/sgetopt.h>
-#include <skalibs/strerr2.h>
-#include <skalibs/tai.h>
-#include <skalibs/iopause.h>
-#include <skalibs/env.h>
-#include <skalibs/stralloc.h>
-#include <skalibs/djbunix.h>
-#include <skalibs/sig.h>
-#include <skalibs/selfpipe.h>
-#include <skalibs/skamisc.h>
-
-#define USAGE "s6-uevent-spawner [ -v verbosity ] [ -l linevar ] [ -t maxlife:maxterm:maxkill ] helperprogram..."
-#define dieusage() strerr_dieusage(100, USAGE)
-#define dienomem() strerr_diefu1sys(111, "build string") ;
-
-static unsigned int cont = 1, state = 0, verbosity = 1 ;
-static pid_t pid = 0 ;
-static tain_t lifetto = TAIN_INFINITE_RELATIVE,
- termtto = TAIN_INFINITE_RELATIVE,
- killtto = TAIN_INFINITE_RELATIVE,
- deadline ;
-
-static inline void on_death (void)
-{
- pid = 0 ;
- state = 0 ;
- tain_add_g(&deadline, &tain_infinite_relative) ;
-}
-
-static inline void on_event (char const *const *argv, char const *const *envp, char const *s, unsigned int len)
-{
- posix_spawnattr_t attr ;
- posix_spawn_file_actions_t actions ;
- size_t envlen = env_len(envp) ;
- size_t n = envlen + 1 + byte_count(s, len, '\0') ;
- pid_t mypid ;
- int e ;
- char const *v[n] ;
- if (!env_merge(v, n, envp, envlen, s, len))
- strerr_diefu1sys(111, "env_merge") ;
-
- e = posix_spawnattr_init(&attr) ;
- if (e) { errno = e ; strerr_diefu1sys(111, "posix_spawnattr_init") ; }
- {
- sigset_t set ;
- sigemptyset(&set) ;
- e = posix_spawnattr_setsigmask(&attr, &set) ;
- if (e) { errno = e ; strerr_diefu1sys(111, "posix_spawnattr_setsigmask") ; }
- sigfillset(&set) ;
- e = posix_spawnattr_setsigdefault(&attr, &set) ;
- if (e) { errno = e ; strerr_diefu1sys(111, "posix_spawnattr_setsigdefault") ; }
- }
- e = posix_spawn_file_actions_init(&actions) ;
- if (e) { errno = e ; strerr_diefu1sys(111, "posix_spawn_file_actions_init") ; }
- e = posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_RDONLY, S_IRUSR) ;
- if (e) { errno = e ; strerr_diefu1sys(111, "posix_spawn_file_actions_addopen") ; }
- e = posix_spawnp(&mypid, argv[0], &actions, &attr, (char *const *)argv, (char * const *)v) ;
- if (e) { errno = e ; strerr_diefu2sys(111, "spawn ", argv[0]) ; }
- posix_spawn_file_actions_destroy(&actions) ;
- posix_spawnattr_destroy(&attr) ;
- state = 1 ;
- pid = mypid ;
- tain_add_g(&deadline, &lifetto) ;
-}
-
-static inline void handle_timeout (void)
-{
- switch (state)
- {
- case 0 :
- tain_add_g(&deadline, &tain_infinite_relative) ;
- break ;
- case 1 :
- kill(pid, SIGTERM) ;
- tain_add_g(&deadline, &termtto) ;
- state++ ;
- break ;
- case 2 :
- kill(pid, SIGKILL) ;
- tain_add_g(&deadline, &killtto) ;
- state++ ;
- break ;
- case 3 :
- strerr_dief1x(99, "child resisted SIGKILL - check your kernel logs.") ;
- default :
- strerr_dief1x(101, "internal error: inconsistent state. Please submit a bug-report.") ;
- }
-}
-
-static inline void handle_signals (void)
-{
- for (;;)
- {
- int c = selfpipe_read() ;
- switch (c)
- {
- case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
- case 0 : return ;
- case SIGCHLD :
- if (!pid) wait_reap() ;
- else
- {
- int wstat ;
- int r = wait_pid_nohang(pid, &wstat) ;
- if (r < 0)
- if (errno != ECHILD) strerr_diefu1sys(111, "wait_pid_nohang") ;
- else break ;
- else if (!r) break ;
- on_death() ;
- }
- break ;
- default :
- strerr_dief1x(101, "internal error: inconsistent signal handling. Please submit a bug-report.") ;
- }
- }
-}
-
-static inline void handle_stdin (stralloc *sa, char const *linevar, char const *const *argv, char const *const *envp)
-{
- while (!pid)
- {
- size_t start ;
- ssize_t r ;
- if (!sa->len && linevar)
- if (!stralloc_cats(sa, linevar) || !stralloc_catb(sa, "=", 1))
- dienomem() ;
- start = sa->len ;
- r = sanitize_read(skagetln(buffer_0, sa, 0)) ;
- if (r < 0)
- {
- cont = 0 ;
- if (errno != EPIPE && verbosity) strerr_warnwu1sys("read from stdin") ;
- }
- if (r <= 0) break ;
- if (sa->len == start + 1)
- {
- start = linevar ? 0 : strlen(sa->s) + 1 ;
- if (start >= sa->len)
- {
- if (verbosity) strerr_warnw1x("read an empty event!") ;
- }
- else on_event(argv, envp, sa->s + start, sa->len - 1 - start) ;
- sa->len = 0 ;
- }
- }
-}
-
-static inline int make_ttos (char const *s)
-{
- size_t pos = 0 ;
- unsigned int tlife = 0, tterm = 0, tkill = 0 ;
- pos += uint_scan(s + pos, &tlife) ;
- if (s[pos] && s[pos++] != ':') return 0 ;
- if (!tlife) return 1 ;
- tain_from_millisecs(&lifetto, tlife) ;
- pos += uint_scan(s + pos, &tterm) ;
- if (s[pos] && s[pos++] != ':') return 0 ;
- if (!tterm) return 1 ;
- tain_from_millisecs(&termtto, tterm) ;
- tain_add(&termtto, &termtto, &lifetto) ;
- pos += uint_scan(s + pos, &tkill) ;
- if (s[pos]) return 0 ;
- if (!tkill) return 1 ;
- tain_from_millisecs(&killtto, tkill) ;
- tain_add(&killtto, &killtto, &termtto) ;
- return 1 ;
-}
-
-int main (int argc, char const *const *argv, char const *const *envp)
-{
- iopause_fd x[2] = { { .events = IOPAUSE_READ }, { .fd = 0, .events = IOPAUSE_READ } } ;
- char const *linevar = 0 ;
- stralloc sa = STRALLOC_ZERO ;
- PROG = "s6-uevent-spawner" ;
- strerr_warnw1x("this program is deprecated, see https://skarnet.org/software/mdevd/") ;
- {
- subgetopt_t l = SUBGETOPT_ZERO ;
- for (;;)
- {
- int opt = subgetopt_r(argc, argv, "l:v:t:", &l) ;
- if (opt == -1) break ;
- switch (opt)
- {
- case 'l' : linevar = l.arg ; break ;
- case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
- case 't' : if (!make_ttos(l.arg)) dieusage() ; break ;
- default : dieusage() ;
- }
- }
- argc -= l.ind ; argv += l.ind ;
- if (!argc) strerr_dieusage(100, USAGE) ;
- }
- if (linevar && strchr(linevar, '='))
- strerr_dief2x(100, "invalid variable: ", linevar) ;
-
- if (ndelay_on(0) < 0) strerr_diefu1sys(111, "set stdin nonblocking") ;
- x[0].fd = selfpipe_init() ;
- if (x[0].fd == -1) strerr_diefu1sys(111, "init selfpipe") ;
- if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ;
- if (selfpipe_trap(SIGCHLD) < 0) strerr_diefu1sys(111, "trap SIGCHLD") ;
- if (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)
- strerr_diefu1sys(111, "setenv PATH") ;
-
- tain_now_g() ;
- tain_add_g(&deadline, &tain_infinite_relative) ;
- if (verbosity >= 2) strerr_warni1x("starting") ;
-
- while (cont || pid)
- {
- int r ;
- if (buffer_len(buffer_0))
- handle_stdin(&sa, linevar, argv, envp) ;
- r = iopause_g(x, 1 + (!pid && cont), &deadline) ;
- if (r < 0) strerr_diefu1sys(111, "iopause") ;
- else if (!r) handle_timeout() ;
- else
- {
- if (x[0].revents & IOPAUSE_EXCEPT)
- strerr_diefu1x(111, "iopause: trouble with selfpipe") ;
- if (x[0].revents & IOPAUSE_READ)
- handle_signals() ;
- else if (cont && !pid && x[1].revents & IOPAUSE_READ)
- handle_stdin(&sa, linevar, argv, envp) ;
- }
- }
- if (verbosity >= 2) strerr_warni1x("exiting") ;
- return 0 ;
-}
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